Delivery-pipe for boiler-feeding apparatus.



B. T. WILLISTON. DELIVERY PIPE FOR BOILER FEEDING APPARATUS.

APPLICATION FILED JUNE 30, I915.

Patented'June 27, 1916..

w. by

Inqzentar %M2y%42% I THE COLUMBIA PIANOCIRAPH co., WASHINGTON D c BELVIN T. WILLISTON, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO THE UNITED INJECTOR COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF NEW YORK.

DELIVERY-PIPE ron aortas-FEEDING'ArrAaATUs.

Specification of Letters Patent. Patented 27 1916 Application filed June 30, 1915. Serial No.'37,201.

To all whom it may concern Be it known that I, BELVIN T. WILLIS- TON, a citizen of the United States, and resident of Somerville, in the county of MiddleseX and State of Massachusetts, have invented new and useful Improvements in Delivery-Pipes for Boiler-Feeding Apparatus, of which the following is a specification.

My invention relates to boiler feeding apparatus, and consists in improvements associated with the delivery pipe thereof, the object of which is to guard against the dangerous and sometimes disastrous water hammering which occasionally takes place, and to accomplish this while conserving the advantages of delivering water by means of a spreader in the steam space of the boiler.

In the drawings hereto anneXed,Figure 1 represents portions of a locomotive boiler in longitudinal vertical section; Fig. 2 is a front end view of my improved sprayer and trap; and Fig. 3 is a horizontal section at line 33 of Fig. 2.

Referring to Fig. 1, the boiler is represented generally by B and the feed water delivery pipe by D with its intake end and check valve at C and its delivery end at E. Preferably, the boiler feed pipe D is inclined upwardly from the intake end at C to the delivery end at E, this inclination being secured in the instance shown by upward bends in the region indicated at D. The delivery end E is located in the upper part of the boiler steam space and at this end I provide a trap adapted to retain water in the feed pipe D which if it be full of water at all times will be effectively protected against the water hammering which occurs when the pipe is only partially filled with water.

The specific and preferred form of protective water-retaining trap is shown in Figs. 2 and 3. In these figures the attachment indicated at E in Fig. 1 is shown on a larger scale. This attachment consists preferably of an integral casting provided with a short entrance duct F adapted to be secured to the end of the delivery pipe D (Fig. 1). The duct F leads to an inner chamber formed with a curved bottom J and upwardly eX- tending walls H, the upper edges of which constitute a dam or trap. These walls H, together with the outer walls G form an outer chamber, the spaces between the walls H and G constituting downwardly pro-- jecting outlet passages I. Preferably also the top of the outer chamber will be me dlally depressed at Gr over the inner chamber so that feed water flowing from the in-;

ner chamber to the outer chamber will be diverted equally and laterally'in' both directions.

In orderthat it should be adapted to operate effectlvely as a water trap, the attachment shown in detail in Figs. 2 and 3 will be so related to the feed pipe D, (Fig. 1) that the upper edges of the'trap. walls H will stand normally at a level higher than that of any portion of the feed pipe. If in additlon to this precaution the feed pipe itself is inclined or bent as at D (Fig. 1), the trap firrture will be even more effective. This inclination of the pipe will also be found particularly desirable if not essential in feed pipes for locomotive boilers which are subect to variations in longitudinal inclination.

With trap protection of the character above described the liability to water hammering due to a reverse rush of steam into the feed pipe following condensation of steam pressure'in the feed pipe and entrance of water at the feed end, due to surging of water in the boiler, is under all normal conditions practically obviated.

The structural member which, by its characteristic and necessary mode of operation, contributes to, and is susceptible to injury from, water hammering, is the check valve at C. This valve, being located outside the boiler shell and at the end of the feed pipe most remote from the delivery end thereof at E, is, under conditions heretofore existing in practice, exposed to the impact of a'column of water of considerable length and weight. Were the check valve, or an auXil iary check valve, to be located at the delivery end of the pipe D, within the boiler, it would, of course, be free from liability to injury from water hammering. valves have been so located, but their susceptibility to the collection of scale or mineral deposits when placed within the boiler shell renders such check valves undesirable, and such arrangements have not proved satisfactory in practice. By providing the trap such as illustrated in the drawing, the outlet of the delivery pipe is left unobstructed, and the trap, by keeping the feed pipe full of water, functions in relationshlp with the check-valve at the other end of the pipe, by

Check I guarding it against the occasional water hammer which otherwise will take place.

I claim:

1. The combination with a feed water pipe for boilers, of a trap for the delivery end of the feed pipe, comprising an inner chamber with upwardly extending trap walls, and an outer chamber with downwardly extending side walls terminating at a level below that of the tops of the trap walls of the inner chamber.

2. The combination with a feed water pipe for boilers, of a trap for the delivery end of the feed pipe, comprising an inner chamber with upwardly extending trap Walls, and an outer chamber with a top medially depressed over the inner chamber and having downwardly extending side walls terminating at a level below that of the tops of the trap walls of the inner chamber.

Signed by me at Boston, Massachusetts, this Qtth day of June, 1915.

BELVIN T. l/VILLISTON. Witnesses:

ODIN ROBERTS, CHARLES D. WOODBERRY.

7 Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. G. 

